What do you call the person who prepares secret agents and handles communications with them when they are under cover?

The person who prepares secret agents and handles communications with them when they are undercover is called a case officer.

Here are some other terms that might be used, depending on the context:

* Handler: This is a more informal term, often used in fiction.

* Control: This term emphasizes the handler's authority and control over the agent.

* Operator: This term is often used in more technical contexts, emphasizing the handler's role in managing the agent's operations.

* Intelligence Officer: This is a broader term that encompasses a variety of roles within an intelligence agency, including case officers.

It's important to note that the specific terminology used can vary between different intelligence agencies and even within the same agency.